Back rest for benches



FIG. 1 is a front perspective view of my back rest for benches, where in the broken line showing of a bench is for illustrative purposes only and forms no part of the claimed design;

FIG. 2 is a front perspective view of my back rest for benches;

FIG. 3 is a front elevational view of the back rest of FIG. 2;

FIG. 4 is a rear elevational view of the back rest of FIG. 2;

FIG. 5 is a top plan view of the back rest of FIG. 2;

FIG. 6 is a bottom plan view of the back rest of FIG. 2;

FIG. 7 is a left side view of the back rest of FIG. 2; and,

FIG. 8 is a right side view of the back rest of FIG. 2. 

The ornamental design for a back rest for benches, as shown and described. 